Inclosed fuse.



W. J. MORGAN.

INCLOSED FUSE.

APPLIOATION FILED AUG. 20, 1913.

Patented Nov. 17, 1914.

7 UNITED STATES PATENT torsion.

WILLIAM I. Monomer, on ST. LOUIS; MISSOURI. ASSIGNORt- BY MESNE ASSIGNMENTS,

TO cahmins IB. MERRELL, or omcnoo, ImmerseiNoLosEn Fuss;

To all whom it may concern Be it known that I, WILLIAM J. Mouoxu, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented certain new and useful Improvementsin Inclosed Fuses, of whichthe following is a specification, reference being same; Fig. 3 is a longitudinal sectional view thereof at right angles to that shown inFigi 2; Fig; 4 isvan'end view of the same; Fig. 5'is a. cross-sectional'= view on'the line 5-5,;Figl Q' Fig. 6 is a cross-sectional View of the fuse as when in course of assemblage of the parts thereof, showing the casing transversely distorted or elongated to receive the contact-blades and their connecting or attached fusible element or link; Fig. 7 is a plan View. with the casing partly hroken away and in longitudinal section, of an inclosed fuse emloodyingmy invention, show ing a slightly modified form of attaching or fastening the fusible'element or link to the contact-blades and also of fastening the endcaps operatively upon the fuse-casing; Fig. 8 is a fragmentary longitudinal sectional view of a slightly modified form of fuse embodying my invention: Fig. 9 isan endview of the form of fuse shown in Fig. 8.

This invention relates generally to electric safety fuses and more particularly to certain'n'ew anduseful improvements in that class of electric safety fuses commonly known as inclosed or cartridge fuses. Fuses of this class usually comprise a hollow shell or casing of fibrous or analogous material, end-caps or closures'tei'minal members or contact-blades extending longitudinally of the casing and projecting therefrom at its endsthrough the end cans, a suitable fusible element or link suitably electrically. connected to'the'contac't blades and bridging the space therebetw'een within the casing, the

fusible element having a current-carrying capacity less than the current-carrying capacity of thecontact-ar'ms and being adapted'to carry the current up'to a certain rated: amperage and to blow or fuse on'an overload dfint'edse' of current, thereby protecting Specification-of Letter's Patent; Application fiiedau ut 20, 1913; Serial at. 785,723

Patented Nov. 1131914 the electric circuit in which the fuse maybe arranged or inserted, as willbe well under stood, anda filling of suitable non-conducting' material, preferably in a finely (litid'ed' state, the" function of which is to dissipate the heat and'provide miii'ute' paths. or interstices for the escape ofthe vapor or gas evolved upon the fusing of blowing of'the fusible'elem'ent. Heietofore, so far asl'am aware, the blade-terminals and eiidf-Ca'p'sfbi do closures of the casing hare been usually se curedwitliin and upon the casing by'nieans of fastening screws or other analogous mem ber'sg but fuses so" constructedare mere-or less difficult of assemblage and m'oreor' less expensive'to'inan'ufacturei J l The objects of my present invention are to provides fuse ofthe class stated wherein the terminal or contact-hlades are rigidly operatively fixed within the fuse-casing is without the use of any separable fastening means or members; to provides fuse of the kind stated having theend-caps or casing closures securely held operalively upon the easing by fastcnin; means or members haw ing no engagement with thefuse-cas'ing and. engaging only with the terminal or contact blades; to provide a fusc'ofthe kind stated of few, readily assembled parts and of simple construction and which may he cheaply and economically manufactured and market ed; and to improve generally upon and sim" plify theconstruction of 'fus es'of'the class mentionedl i With these and other objects in'yieiifl-hij" gr? invention resides in'certain novel features of construction. arrangement, and combination of'parts; all as will hereinafter be described" and afterward. pointed out-in the claims. r In the accomnanying drawings, in which like reference characters refert'o like parts throughout the several-views; and referring now more artici'ilarly'to Figs. 1 to 7, inclu-' sive, 1 in icates the fuse-casing, which is preferably an'open-ended tubular shell of f6?) fibrous or analogous material undflu 'hi'chj' may be of'any'suitable length and dia'incte-ifi as-required' according to the desired size or current carry'ing capacity of the fuse. 2 9 r indicate suitable flanged or cup-shapedpr'efi" 1'05 crahlv metallic caps which are adapted, in the finished fuse, to fit on casing 1 at its opposite ends ma provide-closures therefoii; 3- indicatesthefusihleelehierit or" link,"ii7hjcli 0 is preferably in the fo'rrn'of a -sni gie fiaeiic strip 'of suitable niateriali- LinkB extends lengthwise of, and preferably centrally within,-.;casing 1 and at its opposite ends-is electrically eonnected'as by screws 4 (see Figs. 2 and 3),o'r by solder, as at 5 (see Fig. 7 or by other suitable means, to the preferably reduced inner ends or portions 66 tacts or the like. At a suitable point length 'wise'between their ends, preferably at the base of its reduced inner portion 6, each of said blades 6 is integrally provided with a pair of oppositely-disposed laterally-projecting rigid lugs or fingers 6 preferably rec- 1 tangular in cross-section which are adapted in the finished fuse, to fit-in suitable diametrically opposite openings or perforations 1 v, provided'in casing 1 adjacent the ends thereof, blades 6-6 at said lugs or fingers 6 having each a width approximately equa'hto, or thesame as, the outer diameter of easing 1 and said openings 1 having a size or area,

as shown, just suflicient to accommodate said fingersii. Surrounding fusible element or link 3V and filling the interior of easing 1, is a filling 7 of any suitable non-conducting material, preferably in a finely divided state,

such as slaked lime, adapted to'dissipate the heat and provide minute paths or interstices for the escape of the vapor or gas arising or evolved-upon the fusing or blowing of link 3, and to hold caps 22 firmly upon casing 1 and prevent their being blown off casing l by the expansion of the gases generated on the fusing of link 3, 1 preferably, as shown particularly in Figs. 1 and 2, pass cotter-pins or the like 88 transversely through blades 6G at a point just outside the end face of ca )s 2-2, or employ solder or the'like 9, as s own in Fig. 7, for such purpose, end-caps 2-2 being provided, as is usual, with suitable vent-perforations or openings 10-10 and the flanges thereof being preferably of a length inwardly to overliea'nd cover said casing-openings 1 and the exposed ends of blade-lugs or fingers 6.

In assembling the parts of my new fuse, casing 1, which is somewhat resilient or elastic due to the nature of its fibrous or analogous composition and-may hence be properly described as a resilient casing, is first transversely distorted, asibyimeans of a vise-orother tool or instrument, to ellipma blades 6-6 and their fingers 6, the major axis of casing 1, when soellipticallyt'elons gated, being slightly greater than the width of blades 66 at their said fingers 6, as

shown particularly in Fig. 6. Blades 6-6 and their attached or connected fusible element or link 3 are then lengthwise inserted casing 1, casing 1 and blades 6+6 and their attached or connected fusible element .or link 3 are r igidly, firmly, tightly, and positively held operatively together, the use of elongate the same to accommodate other or additional: fastening members or means for such purpose being entirely obviated; Filling 7 and end-caps 2-2 are now, as described, operativelyplaced within and upon casing 1, when the fuseis ready for marketing. Cotter-pins or the like 8,01 solder 9, extending across or over a considerablearea of the outer faceof-end-caps2-2,, enable end-caps 2 2 to withstand, and prevent end-caps 2-2 being blown off casing 1 by, the expansion or explosive effect of the gases generated within casing 1 on the fusing of element or link 3.

InFig. 8, I have shown a slightly modified form of-iny new fuse which is more particularly adapted for engagement with spring-clips-or analogous circuit terminals. Accordingly, theouter portions 11"11 of the blades 11-11 of the fuse shown in Fig. 8, and which outer portions 11 have preferably the sainewidth as inner blade-portions 11, terminate substantially flush with the outer face of end-caps 22, end-ca )5 2-2 being electrically connected with blades 11- 11 and held operatively upon casing 1 against the expansive force of the gases generated on the fusing of link 3 as by means of solder or the like 12 spread, as shown, upon the outer faces thereof and over the exposed ends of blades 11-11. Otherwise this form of my new fuse is substantially similar in all respects'to the preferred formof my new fuse shown in Figs. 1 to 3, inclusive, blades 11-11 similarly rigidly engagingwith casing 1 by means of laterally-projecting oppositely-disposed integral fingers or lugs 11, as shown.

, My new fuse, as will be evident from the foregoing, is exceedingly simple in construe tion, comprises few parts and the parts of which may be easily and quickly operatively assembled, and-may ;bes economicallyand, I

cheaply manufactured. and it will be seen that by my new fuse I provide a firm and rigid connection between the blades, endcaps, and easing without the use of, or necessity for, any fastening or attaching means, such as screws and the like, which have heretofore, so far as I am aware, been generally employed for such purpose. And it is to be understood that changes in the construction. arrangement, and combination of the several parts of my new fuse may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described m invention, what I claim and desire to secure by Letters Patcut is:

i. In a fuse of the class described, a resilient easing provided with diametrically opposite openings. and a fuse-link terminal having oppositely-disposed rigid securing I portions projecting into said openings and thereby engaging with said casing; sub-- stanti'ally as described.

2. In a fuse of the class stated, a resilient tubular casing provided with diametrically opposite openings, and a fuse-link terminal having oppositely-disposed. rigid securing portions projecting into said openings and thereby engaging with said casing, said openings having 'an area approximately the same as that of the cross-section of said securing-portions; substantially as described.

3. In a fuse of the class stated, a resilient tubular casing provided with diametrically opposite openings, and a fuse-link terminal extending lengthwise of and within said casing and having oppositely-disposed laterally-extending rigid securing-portions suhstantially rectangular in crosssection projecting into said openings and thereby rigidly engaging with said casing, said openings having an area approximately the same as that of the eross-section'of said securingportions; sul'lstantially as described.

4. In a fuse of the class stated, a resilient tubular casing provided with diametrically opposite openings, and a fuse-link blade-terminal extending lengthwise of and within said casing and having oppositely-disposed laterally-projecting integral securing-lugs substantially rectangular in cross-section fitting in said openings and thereby rigidly engaging directly with said casing, the width of said blade-terminal at said lugs being approximatel the same as the outer diameter of said casing and said openings having an area approximately the same as that of the cross-section of said securing-portions; substantially as described.

5. In a fuse of the class stated, a resilient tubular casing provided with diametrically opposite openings, a slotted end cap fitting on and providing a closure for an end of said casing, a fusible element within said casing, and a blade-terminal having oppositely-disposed rigid lateral extensions projecting into said openings and thereby engaging with said casing, said blade-terminal having electrical connection with said fusible element and having a portion fitting in the slot of said end-cap; substantially as described.

6. In a fuse of the class stated, a resilient tubular casin provided with diametrically opposite openings. a slotted end-cap fitting on and roviding a closure for an end of said casing, a fusible element within said casing, a blade-terminal having oppositelydisposed rigid lateral extensions projecting into said openings and thereby engaging with said casing, said blade-terminal having electrical connection with said fusible element and having a portion fitting in the slot of said end-cap, and means engaging with said blade-terminal beyond the end of said casing for securing said end-cap in operative position upon said casing; substantially as described.

7. In a fuse of the class stated, a resilient tubular casing provided with diametrically opposite. openings,- a slotted end-cap fitting on and providing a closure for an end of said casing, a fusible element within said casing, a blade-terminal having oppositelydisposed rigid lateral extensions projecting into said openings and thereby engaging. with said casing. said blade-terminal having electrical connection With said fusible element and having a portion projecting through the slot of said end-cap and providing a circuit-contact member for the fuse, and means engaging with said blade-terminal beyond the end of said casing for securing said end-cap in operative position upon said casing; substantially as described.

8. A blade-terminal of conducting material for a fuse of the class described, the same comprising a body-portion and oppositely-disposed casing-securing lugs projecting laterally from, and lying in the plane of, said body-portion; substantially as described.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM J. MORGAN.

Witnesses:

RUTH Pn'rnnson, ZELMA PINCUS. 

